最新代码

public/sdk/three/jsm/nodes/utils/LoopNode.js

@@ -0,0 +1,200 @@
+import Node, { addNodeClass } from '../core/Node.js';
+import { expression } from '../code/ExpressionNode.js';
+import { bypass } from '../core/BypassNode.js';
+import { context } from '../core/ContextNode.js';
+import { addNodeElement, nodeObject, nodeArray } from '../shadernode/ShaderNode.js';
+
+class LoopNode extends Node {
+
+	constructor( params = [] ) {
+
+		super();
+
+		this.params = params;
+
+	}
+
+	getVarName( index ) {
+
+		return String.fromCharCode( 'i'.charCodeAt() + index );
+
+	}
+
+	getProperties( builder ) {
+
+		const properties = builder.getNodeProperties( this );
+
+		if ( properties.stackNode !== undefined ) return properties;
+
+		//
+
+		const inputs = {};
+
+		for ( let i = 0, l = this.params.length - 1; i < l; i ++ ) {
+
+			const param = this.params[ i ];
+
+			const name = ( param.isNode !== true && param.name ) || this.getVarName( i );
+			const type = ( param.isNode !== true && param.type ) || 'int';
+
+			inputs[ name ] = expression( name, type );
+
+		}
+
+		properties.returnsNode = this.params[ this.params.length - 1 ]( inputs, builder.addStack(), builder );
+		properties.stackNode = builder.removeStack();
+
+		return properties;
+
+	}
+
+	getNodeType( builder ) {
+
+		const { returnsNode } = this.getProperties( builder );
+
+		return returnsNode ? returnsNode.getNodeType( builder ) : 'void';
+
+	}
+
+	setup( builder ) {
+
+		// setup properties
+
+		this.getProperties( builder );
+
+	}
+
+	generate( builder ) {
+
+		const properties = this.getProperties( builder );
+
+		const contextData = { tempWrite: false };
+
+		const params = this.params;
+		const stackNode = properties.stackNode;
+
+		for ( let i = 0, l = params.length - 1; i < l; i ++ ) {
+
+			const param = params[ i ];
+
+			let start = null, end = null, name = null, type = null, condition = null, update = null;
+
+			if ( param.isNode ) {
+
+				type = 'int';
+				name = this.getVarName( i );
+				start = '0';
+				end = param.build( builder, type );
+				condition = '<';
+
+			} else {
+
+				type = param.type || 'int';
+				name = param.name || this.getVarName( i );
+				start = param.start;
+				end = param.end;
+				condition = param.condition;
+				update = param.update;
+
+				if ( typeof start === 'number' ) start = start.toString();
+				else if ( start && start.isNode ) start = start.build( builder, type );
+
+				if ( typeof end === 'number' ) end = end.toString();
+				else if ( end && end.isNode ) end = end.build( builder, type );
+
+				if ( start !== undefined && end === undefined ) {
+
+					start = start + ' - 1';
+					end = '0';
+					condition = '>=';
+
+				} else if ( end !== undefined && start === undefined ) {
+
+					start = '0';
+					condition = '<';
+
+				}
+
+				if ( condition === undefined ) {
+
+					if ( Number( start ) > Number( end ) ) {
+
+						condition = '>=';
+
+					} else {
+
+						condition = '<';
+
+					}
+
+				}
+
+			}
+
+			const internalParam = { start, end, condition };
+
+			//
+
+			const startSnippet = internalParam.start;
+			const endSnippet = internalParam.end;
+
+			let declarationSnippet = '';
+			let conditionalSnippet = '';
+			let updateSnippet = '';
+
+			if ( ! update ) {
+
+				if ( type === 'int' || type === 'uint' ) {
+
+					if ( condition.includes( '<' ) ) update = '++';
+					else update = '--';
+
+				} else {
+
+					if ( condition.includes( '<' ) ) update = '+= 1.';
+					else update = '-= 1.';
+
+				}
+
+			}
+
+			declarationSnippet += builder.getVar( type, name ) + ' = ' + startSnippet;
+
+			conditionalSnippet += name + ' ' + condition + ' ' + endSnippet;
+			updateSnippet += name + ' ' + update;
+
+			const forSnippet = `for ( ${ declarationSnippet }; ${ conditionalSnippet }; ${ updateSnippet } )`;
+
+			builder.addFlowCode( ( i === 0 ? '\n' : '' ) + builder.tab + forSnippet + ' {\n\n' ).addFlowTab();
+
+		}
+
+		const stackSnippet = context( stackNode, contextData ).build( builder, 'void' );
+
+		const returnsSnippet = properties.returnsNode ? properties.returnsNode.build( builder ) : '';
+
+		builder.removeFlowTab().addFlowCode( '\n' + builder.tab + stackSnippet );
+
+		for ( let i = 0, l = this.params.length - 1; i < l; i ++ ) {
+
+			builder.addFlowCode( ( i === 0 ? '' : builder.tab ) + '}\n\n' ).removeFlowTab();
+
+		}
+
+		builder.addFlowTab();
+
+		return returnsSnippet;
+
+	}
+
+}
+
+export default LoopNode;
+
+export const loop = ( ...params ) => nodeObject( new LoopNode( nodeArray( params, 'int' ) ) ).append();
+export const Continue = () => expression( 'continue' ).append();
+export const Break = () => expression( 'break' ).append();
+
+addNodeElement( 'loop', ( returns, ...params ) => bypass( returns, loop( ...params ) ) );
+
+addNodeClass( 'LoopNode', LoopNode );